struts2 formName is undefined
使用doubleselect 出现下错误：exception
org.apache.jasper.JasperExceptionorg.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:476)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:389)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)javax.servlet.http.HttpServlet.service(HttpServlet.java:803)org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:102)org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:389)
root cause
Expression parameters.formName is undefined on line 101, column 43 in template/simple/doubleselect.ftl. - Class: freemarker.core.TemplateObjectFile: TemplateObject.javaMethod: assertNonNullLine: 124 - freemarker/core/TemplateObject.java:124:-1org.apache.struts2.components.UIBean.end(UIBean.java:515)org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)org.apache.jsp.doubleselect_jsp._jspx_meth_s_005fdoubleselect_005f0(doubleselect_jsp.java:185)org.apache.jsp.doubleselect_jsp._jspx_meth_s_005fform_005f0(doubleselect_jsp.java:133)org.apache.jsp.doubleselect_jsp._jspService(doubleselect_jsp.java:76)org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)javax.servlet.http.HttpServlet.service(HttpServlet.java:803)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)javax.servlet.http.HttpServlet.service(HttpServlet.java:803)org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:102)org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:389)
root cause
freemarker.core.InvalidReferenceException: Expression parameters.formName is undefined on line 101, column 43 in template/simple/doubleselect.ftl.freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)freemarker.core.Expression.getStringValue(Expression.java:118)freemarker.core.Expression.getStringValue(Expression.java:93)freemarker.core.DollarVariable.accept(DollarVariable.java:76)freemarker.core.Environment.visit(Environment.java:208)freemarker.core.MixedContent.accept(MixedContent.java:92)freemarker.core.Environment.visit(Environment.java:208)freemarker.core.Environment.include(Environment.java:1477)freemarker.core.Include.accept(Include.java:169)freemarker.core.Environment.visit(Environment.java:208)freemarker.core.MixedContent.accept(MixedContent.java:92)freemarker.core.Environment.visit(Environment.java:208)freemarker.core.Environment.process(Environment.java:188)freemarker.template.Template.process(Template.java:237)org.apache.struts2.components.template.FreemarkerTemplateEngine.renderTemplate(FreemarkerTemplateEngine.java:182)org.apache.struts2.components.UIBean.mergeTemplate(UIBean.java:559)org.apache.struts2.components.UIBean.end(UIBean.java:513)org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)org.apache.jsp.doubleselect_jsp._jspx_meth_s_005fdoubleselect_005f0(doubleselect_jsp.java:185)org.apache.jsp.doubleselect_jsp._jspx_meth_s_005fform_005f0(doubleselect_jsp.java:133)org.apache.jsp.doubleselect_jsp._jspService(doubleselect_jsp.java:76)org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)javax.servlet.http.HttpServlet.service(HttpServlet.java:803)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)javax.servlet.http.HttpServlet.service(HttpServlet.java:803)org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:102)org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:389)
方法一：需要指定formName ，给form起个名字 ，如<s:form action="Store" name="form0" >，
doubleselect默认找到这个form0。
方法二：指定formName ，给form起个名字的同时再doubleselect中指定其formName=“form0”
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